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单选题
John, how lazy you are! This work ______ three days ago.
A
should have done
B
must have been done
C
should have been done
D
might have done
参考答案
参考解析
解析：
句意：这份工作本该三天前完成的。should have done表示应该做而没有做，含有责怪之意。must have done意为“一定做了”，表示肯定的推测。
句意：这份工作本该三天前完成的。should have done表示应该做而没有做，含有责怪之意。must have done意为“一定做了”，表示肯定的推测。
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